Answer: C. As the bath cools, it loses energy to the reaction. Energy transferred from the surroundings to the reaction makes the reaction endothermic.

A: identifies the reaction as endothermic but reverses the direction of energy transfer.
B: gives the correct direction of transfer but labels energy absorbed by the reaction as exothermic.
D: treats the bath’s cooling as evidence that the reaction releases energy, reversing the transfer direction and classification.
Remember: an endothermic reaction takes in energy from its surroundings.